Fiber Optic Solutions for fusion power plants

Fiber Optic Solutions for power plantsAccording to the researchers from the American university, the faster specialists can detect thermal shifts the faster they can prevent disruptive quench in the HTS magnets for fusion devices in power plants. That is why scientists hope to solve this issue with the help of newly developed fiber optic solutions.

Recently, fusion became considered a safe, constant, and carbon-free energy source. The HTS magnets play a crucial role in many such programs. It increases the necessity of different instruments such as sensors and controls that help magnets to work in severe environmental conditions of a fusion power plant.

The research team had an aim to prevent quenches in power plants that are based on magnetic-confinement fusion devices. Scientists also focused on the commercialization, availability, and simplicity in the conditions of the accelerating fusion’s viability as an energy source. They aimed to create a fiber optic system that would provide minimal risks and would be robust.

Scientists used optical fibers with fiber Bragg gratings (FBGs) as a promising instrument that can measure temperature. FBG reflects just one of the wavelengths that are determined by the spacing while most of the light passes through. The reflected wavelength can demonstrate the small differences in temperature and strain. That is why the installation of fiber Bragg gratings along the fiber optic cable can help in temperature monitoring all over the length.

FBGs have been applied in many various areas for strain and temperature measurement. However, according to the researchers, they’ve never been applied for larger cables with high current densities as they have. This cable is able to handle the intense electrical and electromagnetic stresses of severe environmental conditions.

The research team designed new ultra-long fiber Bragg gratings. They behave as a long quasi-continuous FBG, but all the lengths can be meters long instead of millimeters. When the usual FBGs can monitor temperature locally, these new fiber Bragg gratings can simultaneously trace the temperature modifications along the whole cable. This fiber optic technology enables fast detection of temperature changes regardless of the heat source location. It means that the accurate location can’t be defined but the utmost importance in such systems is early detection of the problem.

As a result of the real operating conditions, the fiber optic system was able to detect small temperature changes very quickly. It was even demonstrated to be more effective than the usually applied voltage taps. Moreover, the FBG sensors’ response times could be tuned and their sensitivity became higher as quench regions expanded. All these helped to find quench events faster in comparison with voltage taps even in difficult cases.

The research team offered the fiber optic system providing the technological effectiveness and minimal technological risk of the approach. And scientists are sure that they can make a contribution to other industries where superconducting magnets are really important with the help of fiber optic technology.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, for example, fbg strain sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

FBG sensors for healthcare applications

Fiber Bragg Grating Sensors for healthcareA collaboration of scientists from different countries (China, Pakistan, and Hong Kong) have developed new 3D printed FBG sensors that can help in creating the ‘smart beds’. Scientists have worked to determine the main advantages of the innovative 3D printed FBG sensors and their applications in different spheres.

3D printing has demonstrated enormous results in different scientific fields. It helps to reduce the costs and makes the production process much easier for the developers. The university scientists have already applied it in their different devices with potential healthcare applications.

The main goal of this development based on the fiber Bragg grating sensors was to track sleeping patterns with high precision. First, the research team hopes that this fiber optic solution can be helpful for hospitals to monitor the well being of patients. Moreover, these fiber Bragg grating sensors are temperature-insensitive, lightweight, and high-accurate. That increases their chances to be installed in more hospitals and improves the quality of care because the staff could respond more quickly when the patients’ condition deteriorates.

Usually, FBGs are a microstructure that length is a few millimeters. It is implemented into a short optical fiber that can transform the light in response to temperature, strain, or vibration. FBG sensors are highly applied in mechanical engineering, textile, and medical spheres, thanks to their high thermal sensitivity.

Nowadays, the production of FBG sensors for healthcare still remains a time-consuming and equipment-intensive process that is hard to replicate. While 3D printing is an advanced technology that allows the creation of complex FBG sensing devices. Moreover, fiber Bragg grating sensors have never been applied to sleep-monitoring.

During the first experiments, the 3D printed FBG sensors were tested while putting under pressure loads. Each device demonstrated a number of consistent wavelengths which leads to the possibility of providing reliable readings. The final tests on fiber Bragg grating sensors were held by placing them under the mattress of a bed. A person demonstrated several sleeping positions while the FBG sensors were tracking his changes in posture.

According to the results, the FBG sensors’ readings were almost precise and had an error rate of less than 1%. Nevertheless, the research team considers that this fiber optic technology still has potential in the future. They could, for example, track a patient’s breathing and identify when the heart rate has begun to fall. And that is not the first time that fiber optic technology can prove beneficial to medicine.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, for example, FBG strain sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

FBG sensors in monitoring road conditions

FBG sensors monitoring road conditionsScientists from Latvia made a number of experiments using fiber optic technology for monitoring the condition of the road surface. They chose special FBG sensors that can collect data about roadway changes, like changes in the strain and temperature. These fiber optic solutions that also include applying fiber Bragg gratings (FBGs) will help in designing reliable roads and planning for road repairs.

The process of pavement destroying can’t be completely stopped. However, we can apply more strong materials and repair small cracks in the structure at the early stages. That is why we require new monitoring methods and the most effective ways are fiber optic solutions.

According to the research, the fiber sensors could define the roadway defects and measure the load on the site. So with the help of fiber optic sensors, it will be possible to consider the pressure and vibration created by transport in the area and strengthen the coverage in the right places.

Scientists chose fiber optic systems because fiber optic sensors are highly sensitive and do not require a power supply. Fiber sensors can be installed in an existing fiber optic network and receive data remotely. The basis of fiber optic sensors contains fiber Bragg gratings (FBGs). It is a section in the middle of an optical fiber, where the refractive index of light has been changed using ultraviolet radiation. As a result, such a section always reflects radiation only in a very small part of the spectrum and transmits the rest of the light without loss. The fiber Bragg grating (FBG) can be formed so that the wavelength of the reflected light depends on changes in temperature, pressure, or other physical aspects. Because of these parameters, fiber Bragg grating sensors are effective for application.

Scientists placed two types of fiber optic sensors on one of the highways during its renovation. The first one measured deformations in construction, the other detected temperature. Since unprotected fiber sensors are quite fragile, they were packed in composite and ceramic tubes. The first test demonstrated that the most precise strain measurements are possible when the load is placed exactly at the location of the fiber optic sensors. Researchers also specified that temperature plays a crucial role in the deformations of the asphalt. And the final key aspect of the tests with fiber optic technology was monitoring real traffic and defining the truck’s quantity.

Finally, the experiments demonstrate that fiber optic sensors can measure the deformations of the roadway with sufficient accuracy. By applying FBG sensors specialists can determine the moment when the limit of permissible deformations will be exceeded in the selected area. That will definitely help in designing new roads and repairing the existing ones.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, for example, FBG strain sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

FBG Sensors for power plants

FBG Sensors for power plantsNowadays researchers tend to use fusion as a safe energy source at power plants. Nevertheless, this process is dangerous. It requires reliable fiber optic technology for structural health monitoring at power plants. Novel fiber optic sensors offer robust operation in the harsh conditions of a commercial fusion power plant.

To be more precise, these fiber sensors provide temperature sensing applying optical fibers with written fiber Bragg gratings (FBGs). The FBG operating principle is based on broadband light that is directed on it. Although most of the light goes through, one wavelength is reflected. Herewith, the reflected wavelength changes with both temperature and strain.

Therefore, the installation of several fiber Bragg gratings enables performing independent temperature sensing of each location. Standard FBGs are widely used in various industries for strain and temperature sensing. Herewith, compact superconducting cables use these optical fibers based on fiber optic technology.

Novel FBG sensors can maintain “the intense electrical, mechanical, and electromagnetic stresses of a fusion magnet’s environment.” The novel fiber optic technology supposes ultra-long fiber Bragg gratings of 9-millimeter located 1 mm apart. The FBG sensors operate as conventional long quasi-continuous systems.

Compared to standard systems, FBG sensors include such benefits as long grating length (meters instead of millimeters). Ultra-long FBGs allow for sensing simultaneously occurring temperature changes along their entire length. Thus, it is possible to determine fastly temperature variation, irrespective of the location of the heat source.

Additionally, it is possible to combine ultra-long FBGs and traditional FBGs to produce both spatial and temporal resolution. The fiber optic technology has been developed by a team of researchers from Switzerland. According to them, such a combination can be used on bigger cables.

These FBG sensors detect quickly and accurately even the smallest temperature changes under realistic operation conditions. Moreover, they demonstrate a better signal-to-noise ratio thanks to their high level of sensitivity and the opportunity to adjust the optical fiber response.

Thus, the fiber optic sensors locate quench events tens of seconds faster than voltage taps. Herewith, the application of FBG sensors for HTS magnets quenches detection is very potential. It allows for overcoming the current problem of  HTS coils from damage during quenches.

Finally, such a fiber optic technology plays a crucial role in compact fusion processes, where practical, high-field, high-temperature superconducting magnets are important. FBG sensors are still under development and need some improvements to be used in new applications.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, for example, fbg strain sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

FBG sensors for temperature and pressure measurement

FBG sensors for temperature and pressureNowadays fiber optic solutions play a crucial role in information technology. Fiber optic technology promotes the development of advanced fiber optic sensors. These fiber sensors offer numerous benefits that make them very attractive. The benefits include “durability, flexibility, biocompatibility, high sensitivity, and electromagnetic interference immunity.”

The applications of fiber optic sensors consist of numerous fields. They are widely used in medicine, environmental protection, industrial production, and structural health monitoring. Herewith, different types of fiber sensors allow for measuring various physical and chemical parameters. For instance, they sense temperature, acoustic, pressure, humidity, and others.

The production of distributed sensing systems requires different types of fibers. The following types are the most popular: photonic crystal, polarization-maintaining, double-core, sapphire optical fibers, etc. It should be noted that various fiber optic sensors use various measurement principles. Additionally, fiber Bragg gratings (FBGs) – the most popular measurement principle.

FBG sensors can also perform multi-parameter measurements to meet the practical demands of scientists. Thus, a team of researchers has demonstrated a cascaded multi-mode FBG sensor that performs the dual-parameter measurement. They apply optical fiber with several modes to create a distributed sensing system. Moreover, the FBG sensors measure the Brillouin frequency shift for temperature and strain sensing.

To be more precise, these FBG sensors have a hybrid structure (FBGs and FPI) with a nano-silica diaphragm on the tip. Besides, the total length of the fiber sensor is less than a human hair. These FBG sensors determine both environmental temperature and pressure. Therefore, such a fiber optic solution is highly promising in specific applications in severe environments.

Finally, the hybrid fiber optic sensor has been already produced and even tested. The distributed sensing system includes an FPI with a silica diaphragm. Also, fiber optic technology applies the femtosecond laser inscription technique and arc discharge methods. These FBG sensors demonstrate a high level of pressure and temperature sensitivity.

Additionally, the fiber optic sensor has an ultra-low level of cross sensitivities. “The temperature-induced error of the pressure measurement was –1.4286 kPa/ and ℃ pressure-induced error of the temperature measurement was ~0℃/MPa.” The mentioned-above benefits of FBG sensors make them perfect for numerous fields of applications.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, for example, fbg strain sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

Fiber optic sensors for ammonia detection

FBG sensors for ammonia detectionA team of scientists from Denmark in a collaboration with chemical engineers has presented novel accurate fiber optic sensors. They allow for significantly decreasing the level of air pollution. The operating principle of this fiber sensor is based on modern telecom technology. It helps to detect and measure ammonia in the atmosphere by the sensing system, a laser, and hollow-core optical fibers.

To be more precise, the fiber optic system provides continuous ammonia monitoring for agricultural application. Additionally, the fiber optic sensor can be created at a pretty low cost. The benefits of fiber sensors such as compact size, high reliability, and low cost meet the requirements of a portable system for detecting ammonia.

It should be noted that such a fiber optic technology is still under development. The thing is that the sensitivity of the fiber sensor requires improvements, which scientists try to perform. Even though the main purpose of the new sensing system is ammonia detection, it is possible to use fiber optic sensors for the detection of other gases, for instance, greenhouse gases. 

Moreover, fiber optic technology operates as a part of one agricultural project. In this project, scientists develop new techniques and technology to measure and reduce air pollution from the agricultural sector. Nowadays the agricultural sector is considered to be the main contributor to air pollution (mainly caused by ammonia). Therefore, agricultural pollution is the biggest environmental issue that requires efficient fiber sensors.

The thing is that now ammonia emissions are challenging to measure at the farm level. Compared to novel fiber optic sensors, traditional systems for ammonia detection have a high cost. Fiber optic technology is very promising with great prospects for agriculture. “The ability to continuously and cost-effectively track the development in ammonia emissions from agriculture offers completely new opportunities for the industry to experiment on decreasing the emissions.”

Scientists claim that there are already established figures considering air pollution from agriculture. Nevertheless, the future potential of fiber optic sensors may greatly transform the detection way of ammonia caused by agricultural farms. The new fiber optic technology promotes farmers to control their emissions continuously.

Finally, precise monitoring of ammonia emissions provided by sensing systems makes streamline operations far better. Thus, fiber sensors lead to emissions-based regulations that help reduce the environmental impact of agriculture. The development of these fiber optic sensors will continue until the next year.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, for example, fbg strain sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

Fiber optic sensors for metal ions detection

FBG sensor for metal detectionFluorescent fiber optic sensors find their popularity in online and in-situ detection of metal ions. These fiber sensors allow for predicting and preventing the environmental problems caused by the ions. To be more precise, this type of sensor is different from refractometer-based ones. The fluorescent fiber optic sensors have a simple structure and their properties play a crucial role in sensing performance.

It should be noted that metal ions cause heavy metal pollution resulting in significant harm to the environment and people. Nowadays metal pollution is regarded as a serious worldwide problem. Therefore, the problem requires quick and effective sensing systems to determine the level of metal ions pollution. The use of fiber optic sensors is a perfect solution.

Some researchers propose the use of fluorescent materials in the new fiber sensors. They claim that fluorescent optical fibers enable them to transmit valuable data for real-time sensing process. Additionally, these fiber optic sensors offer such advantages as long-life span and immunity to electromagnetic interference. The is the main reason why fluorescence sensing systems are ideal in field and emergency analysis.

The design of the fluorescent fiber sensors includes “an excitation light source, an optical fiber with the sensor probe, a spectrometer, and a computer.” The operating principle is based on the excitation light that expands along the fiber and the fiber optic sensor to obtain a fluorescent response back. Moreover, the researchers confirm that some biomaterials can collect heavy metal ions.

Thus, it is possible to apply their derivatives as fluorescent sensing systems. Recently researchers have created several fiber sensors based on fluorescent materials to detect metal ions that include the following:

  • Protein labeled sensing systems

It is not a novel type of fiber optic sensor, it has appeared almost 20 years ago. Protein labeled sensors do not depend on the fluorescent membrane and only transmit the light.

  • Nucleic acid-based fiber sensors

These sensors provide a high level of sensitivity and specificity. Also, nucleic acid-based sensing systems are very promising for on-site environmental monitoring. 

  • Luminescent nanomaterials-based fiber optic sensors

Even though they have more benefits than other types, these sensors demonstrate high selectivity at a minority of metal ions.

Finally, the mentioned above fiber optic solutions are very potential for the detection of metal ions, for example, in environmental water samples. Nevertheless, the sensing system is not ideal and has some problems to be overcome. 

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, for example, fbg strain sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

Dynamic gratings produce new fiber optic sensors

FBG sensors with dynamic gratingsResearchers have presented dynamic gratings used instead of depending on fixed-position fiber Bragg gratings, and now core-launched laser beam light can unite to the cladding modes of conventional optical fiber resulting in distributed fiber sensing of the external environment.

The thing is that fiber optic sensors allow distinguishing between chemicals and liquids external to the optical fiber, herewith, they are usually based on refractive-index changes in the cladding modes of the fiber. Moreover, fixed-position fiber Bragg gratings (FBGs) are applied to excite these cladding modes and unite laser beam light from the core mode.

Nevertheless, FBG sensors need specific equipment to create the gratings at the optical fiber, also they only work as point sensors at specific, predetermined locations. A team of researchers from Israel tries to overcome these challenges by developing dynamic gratings at reconfigurable short sections along with the optical fiber.

Thus, the new gratings are independent of any permanent change in the fiber structure. It is possible to switch them on and off at will, and fiber optic sensors based on dynamic gratings allow scanning along with the optical fiber. According to researchers, after the installation of a grating, its effect is not restricted only to light in the core mode.

Similar to conventional FBGs, the dynamic gratings also unite laser beam light between core and cladding modes. Herewith, in analogy to fiber Bragg gratings, such connection will occur for the light at very specific frequencies. “An optical probe wave of tunable frequency is launched at the dynamic grating, and the exact frequency in which coupling takes place is carefully noted.”

Compared to FBGs, dynamic gratings enable the researchers to carry out tests in any chosen position. It should be noted that the developed fiber optic sensors have been already tested over 2 m of traditional optical fiber. To be more precise, fiber sensors consisted of  8 cm length dynamic gratings perform scanning along with the optical fiber resulting in the combination of spectra between core and cladding modes in each position.

Measurements accurately detect the parts of optical fiber that were immersed in ethanol and water, herewith, the fiber sensors can distinguish between the two with an 8 cm resolution. At the same time, the refractive index outside the fiber is possible to estimate precisely with fourth-decimal-point accuracy (0.0004).

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

What you should know about fiber Bragg gratings

fiber Bragg gratings (FBGs)Fiber Bragg gratings are currently widely used in optical fibers and light guides for compaction of channels along the wavelength, optical filtering of signals, as resonator mirrors in fiber and semiconductor laser systems, as smoothing filters in optical amplifiers, to compensate for dispersion in the main communication channels.

Another field of application of FBG technology includes its use in various measuring systems that control environmental parameters, such as temperature, humidity, pressure, deformation, and chemical content. Bragg gratings distributed along the length of the light guides allow for creating distributed acoustic systems that differ favorably from traditional complexes of the same purpose in cost and technology of production.

FBG technology for recording Bragg gratings distributed in a light guide is a key element in creating a new generation of measurement systems. Hydroacoustic antennas developed on the basis of such optical fibers, as well as systems for the protection of extended objects and systems for monitoring the condition of main pipelines, are increasingly being used abroad. 

A distinctive feature of these fiber optic systems is the large extent of controlled zones, speed, and unique information capabilities. When fiber Bragg gratings are written at a standard optical fiber, a problem arises because of the fact that such a fiber has weak photosensitivity and a low saturation threshold, which is not sufficient for effective recording of gratings. 

The main solution method of FBGs is to increase the concentration of germanium dioxide in the core. Other methods consist of alloying the pieces for the creating of optical fibers with such chemical elements as boron, tin, nitrogen, phosphorus, antimony together with germanium, which leads to an increase in the photorefractive power of the light guides.

Writing of fiber Bragg gratings can be classified by the type of laser system used for production, the wavelength of beam emission, the recording technique, the irradiated material, and the type of Bragg grating. Lasers used for FBG writing can be either continuous or pulsed, with a wavelength of emission from the infrared (IR) to the ultraviolet (UV) range of the spectrum. 

These differences determine the spatial and temporal coherence of the optical emission sources used for writing, which, in turn, determines the choice of the appropriate method for recording fiber Bragg gratings. The main methods for FBG writing include the step-by-step method, the phase mask method, and the interferometric method.

The need to increase the speed of information transmission, associated with the development of telecommunications, increasing information flows, the growth of global information systems and databases, the expansion of the number of users, led to the fact that fiber optic system communication lines were developed using spectral multiplexing of optical channels.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com

Multi-addressed fiber Bragg gratings for microwave sensors

multi-adressed FBGsNowadays fiber Bragg gratings (FBG)  face several challenges in fiber optic sensor systems because of their complex installation and the high cost of interrogators provided by interrogation methods and FBG multiplexing. The thing is that such features as wavelength, time, frequency, polarizing, and spatial division multiplexing necessary for most applications also need complex tools, for instance, spectrum analyzers, spectrometers with tunable interferometers, Bragg gratings, etc.

It should be noted that one more challenge for FBG sensors include “the fact that these sensors are not addressable per se, and therefore, any spectrum overlapping leads to interrogation errors.” The possible way to overcome the problem is to use the addressed fiber Bragg gratings combined with the microwave photonics interrogation technique. The addressed FBG is considered to be a specific type of fiber Bragg gratings with two narrow notches in the reflection spectrum.

The operating principle is based on the light that passes through the FBG that has two narrow optical frequencies, herein, the difference between them is less than an optical frequency and installed in the microwave range. Such an addressed frequency does not depend on stress or temperature fields, it is also independent of fiber Bragg grating’s central frequency shifting.

The addressed FBG sensors act both as a two-frequency source and as a fiber optic sensor of the measurement system simultaneously. Thus, it is possible to develop a microwave-photonic fiber optic sensor system based on arrays of the addressed fiber Bragg gratings, if the set of address frequencies in the array is regarded as orthogonal. The addressed FBGs, in their turn, allow designing multi-addressed fiber Bragg grating structures.

The thing is that multi-addressed FBGs apply three (or more) frequency carriers, while their beatings on a photodetector create three (or more) address frequencies. The combination of address frequencies enables increasing the fiber optic sensor capacity of the measurement system as well as increasing the precision of central wavelength determination. Therefore, the multi-addressed FBGs are regarded as a specific type of fiber Bragg gratings with three (or more) narrow notches in the reflection spectrum.

The operating principle of the multi-addressed FBGs is based ion the light with three (or more) narrow optical frequencies, and the difference between them is less than an optical frequency and is placed in the microwave range. Additionally, the address frequencies set in FBG sensors does not depend on strain or temperature fields, central frequency shifting as well. Finally, the multi-addressed fiber Bragg gratings are both a multi-frequency source and a fiber optic sensor of the measurement system at the same time leading to the appearance of new applications.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in structural health monitoring systems and want to learn more, please contact us at info@optromix.com